Improvement in turpentine-filters



F. G. RICHARDSON.

Turpentine Filters.

No. 142,276. Patented August26,1873.

NITED STATES PATENT OFFICE.

FREDERICK Gr. RICHARDSON, OF BROOKLYN, NEVV- YORK.

IMPROVEMENT IN TURPENTINE-FILTERS.

Specification forming part of Letters Patent No. 142,276, dated August26, 1873; application filed December 17, 1872.

To, all whom it may concern: v

Be it known that I, FREDERICK G. R1011- ARDSON, of Brooklyn, in thecounty of Kings and State of New York, have invented an Improvement inTurpentine-Filters, of which the following is a specification:

In the manufacture and purification of turpentine and resin it isessential to filter the same in a melted, and consequently a hot,

condition through wire-cloth filters; and it has been universallyexperienced in practice that the filters ordinarily in use are, fromfaults inherent in their construction, fragile and quickly worn out,owing to incapacity to resist the severe usage to which they arenecessarily subjected. With the woven-wire fabric heretofore employedfor the purpose it is impossible to provide the requisite fineness ofmesh or minuteness in the interstices of the filter to sufficientlystrain the hot material without using wire wholly inadequate from itsfineness to support the wear and tear brought to bear on it. To providea remedy for the loss thus experienced in the production of marketableturpentine and resin is the object of this invention, which consists ina turpentine-filter, a new article of manufacture, constituted by thecombination of a twilled wire-cloth straining-web and a circumferentialrim, so applied as to hold the same in position against the weight orpressure of the liquid undergoing filtration, whereby the desired objectis effectually secured.

Figure 1 is a plan view of a turpentine filter made according to myinvention. Fig. 2 is a vertical transverse sectional view of the same.Fig. 3 is an enlarged view, showing the arrangement of the wiresconstituting the strainers medium in the filter.

A is the straining-web of the filter, made of any desiredcircumferential contour and formed of that special variety of wire-clothwhich, from the peculiarities of" its structure, is known as twilledwire-cloth. In this the diameter of the wire of which it is composed Iis much greater in proportion to the size of mesh or diameter ofinterstice than is the case with plain wire-cloth. Greater strength anddurability to resist the specially-destructive action of the hotmaterial upon the fabric is thus obtained when the straining web is madeof this twilled wire fabric-never, before the the date of my invention,used for such purpose and having practically no superiority for anyother filtering purpose over the plain wire-cloth preferred forstraining cold and comparatively quick-flowing or limpid liquids.

Firmly fixed at its lower edge to the circumference of the web A, is theperipherical rim B, which, holding the said edges, supports and keepsextended the twilled wirecloth web A, while the same is subjected tostrain while filtering melted .resin or turpentine, as hereinbeforeexplained, the increased diameter of the wire, as compared with the sizeof the mesh, enabling the same to resist with hitherto unusualefficiency the tensile strain exerted by the material while upon andpassing through the filter, and affording a wider margin for theinjurious effects of a high temperature upon the wire, and that involvedin the expansion and contraction of the same by the variations through awide range of temperature, involved in the practical use of the filter.This last advantage, furthermore, is greatly enhanced by the increasedcurve given to the wire at each intersection by the twilled character ofthe fabric, the said greater curves allowing the wire more readily toaccommodate itself to the changes in length arising from the variationsin temperaturev just set forth.

What I claim as my invention is- As a new article of manufacture, theturpentine-filter constituted by the combination of the twilledwire-cloth web A and the circumferential rim B, substantially as and forthe purpose specified.

' F. G. RICHARDSON. Witnesses:

W. E. PARTRIDGE,

GEoRGE J. BARRY.

